Bus

Converter

Product # BQ55090QTA27

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-2BQ559J Rev. C

04/02/09

Page 1

Technical

Specification

BQ55090QTA27

BQ55090QTA27

Module

Page No.

MECHANICAL DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

BQ55090QTA27 ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . .3-4

BQ55090QTA27 Standards and Qualifications. . . . . . . . . . . . . . . . . . . . 5

BQ55090QTA27 Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-9

Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13

ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Contents

Operational Features

• High efficiency, 96 % at full rated load current at

full load

• Delivers full power with minimal derating

- no heatsink required

• Operating input voltage range: 36-55 V dc

• Fixed frequency switching provides predictable EMI

• No minimum load requirement

Mechanical Features

Control Features

Protection Features

36-55 V

55 V

9.6 V

240 W

2000 V dc Quarter-brick

Continuous Input Transient Input

Output

Max Power

Isolation

DC-DC Converter

generation, board-mountable, isolated, fixed switching

frequencydc/dc converter that uses synchronous rectification

to achieve extremely high conversion efficiency. The power

dissipated by the converter is so low that a heatsink is not

required, which saves cost, weight, height, and application

effort. The BusQor series provides an isolated step down

voltage from 48V to 12 or 9.6V intermediate bus with no

regulation in a standard “quarter-brick” module. BusQor

converters are ideal for creating the mid-bus voltage required

to drive point-of-load (non-isolated) converters in intermediate

bus architectures.

• Industry standard quarter-brick pin-out configuration

(two or four output pin option)

• Size: 1.45” x 2.3” (36.8x58.4mm)

• Total height: 0.445” (11.3mm)

• Total weight: 1.5 oz (42 g)

• Input under-voltage lockout and over-voltage

shutdown protects again abnormal input voltages

• Output current limit and short circuit protection

(auto recovery)

• Output over-voltage protection

• Thermal shutdown

• On/Off control referenced to input side

• Inherent current share (by droop method) for high

current and parallel applications.

• 2000 V input-to-output isolation

• UL 60950-1:2003

• CAN/CSA-C22.2 No. 60950-1:2003

• EN60950-1:2001

• Needle Flame Test (IEC 695-2-2)

• IEC 61000-4-2

• RoHS compliant (see page 14)

Safety Features